TCP简单的服务端代码（C语言）

 1 #include <stdio.h>
 2 #include <strings.h>    //bzero
 3 #include <unistd.h>     //close
 4 #include <sys/socket.h> //socket
 5 #include <netinet/in.h> //struct sockaddr_in
 6 #include <arpa/inet.h>  //inet_addr
 7 int main(int argc, char const *argv[])
 8 {
 9     // 1.创建套接字
10     int sockfd = socket(AF_INET, SOCK_STREAM, 0);
11     if (sockfd < 0)
12     {
13         perror("socket");
14         return -1;
15     }
16     // 2.绑定bind
17     struct sockaddr_in my_addr;
18     my_addr.sin_family = AF_INET;
19     my_addr.sin_port = htons(8000);
20     my_addr.sin_addr.s_addr = htonl(INADDR_ANY); // 机器的所有可用IP地址
21     int ret = bind(sockfd, (struct sockaddr *)&my_addr, sizeof(my_addr));
22     if (ret != 0)
23     {
24         perror("bind");
25         return -1;
26     }
27     // 3.监听
28     int backlog = 10;
29     ret = listen(sockfd, backlog);
30     if (ret < 0)
31     {
32         perror("listen");
33         return -1;
34     }
35     // 4.提取，等待一个客户端连接
36     struct sockaddr_in cli_addr;
37     socklen_t len = sizeof(cli_addr);
38     int sockfd_new = accept(sockfd, (struct sockaddr *)&cli_addr, &len);
39     if (sockfd_new < 0)
40     {
41         perror("accept");
42         return -1;
43     }
44     // 5.接收数据
45     char buf[1024] = "";
46     char ip[16] = "";
47     while (1)
48     {
49         bzero(buf, sizeof(buf));
50         recv(sockfd_new, buf, sizeof(buf), 0);
51         inet_ntop(AF_INET, (void *)&cli_addr.sin_addr, ip, 16);
52         printf("%s:%hu--->%s\n", ip, ntohs(cli_addr.sin_port), buf); // ip port buf
53         send(sockfd_new, "ok", sizeof("ok"), 0);                     // 发送消息
54     }
55     // 6.关闭套接字
56     close(sockfd_new);
57     close(sockfd);
58     return 0;
59 }